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int main(void)
{
long long length=5000000000ll;
char *p=new char[length];
if(!p)
memset(p, 48, length);
cout << p[length - 1] << endl;
return 0;
}
long long length=5000000000ll;
char *p=new char[length];
if(!p) //判断成功与否
exit(1);
memset(p,48,length);
cout < <p[length-1] < <endl; //输出0